Several ways in which computer-Aided Control System Design software and rapid prototyping tools have been used to enhance the controls educational program at our university are described. A key to the use in a lecture...
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Several ways in which computer-Aided Control System Design software and rapid prototyping tools have been used to enhance the controls educational program at our university are described. A key to the use in a lecture course has been to provide the students with a computer running the software during every exam. This motivates the students to learn to use the software and facilitates giving exam problems that focus on control design and analysis rather than on mechanical calculations. The use of computer-aided design software and rapid prototyping tools in the lab saves money and allows us to do more complicated experiments and simple projects. It also allows us to emphasize aspects of networked and embedded control systems that are not covered anywhere else within our curriculum.
In this paper we look at the serial concatenation of linear block codes with a rate-1 recursive convolutional code (accumulator). In particular, we present results for extended Bose Chaudhuri Hocquenghem (eBCH) codes....
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ISBN:
(纸本)9783800729470
In this paper we look at the serial concatenation of linear block codes with a rate-1 recursive convolutional code (accumulator). In particular, we present results for extended Bose Chaudhuri Hocquenghem (eBCH) codes. These codes offer low error floors, good performance and more flexible rate choices than product codes. Reduced complexity list decoding is used to decode the eBCH codes in order to maintain low decoding complexity.
We present a novel scheme for the transmission of H.264/AVC video streams over lossy packet networks. The proposed scheme exploits the error resilient features of H.264/AVC codec and employs Reed-Solomon codes to prot...
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We present a novel scheme for the transmission of H.264/AVC video streams over lossy packet networks. The proposed scheme exploits the error resilient features of H.264/AVC codec and employs Reed-Solomon codes to protect effectively the streams. The optimal classification of macroblocks into slice groups and the optimal channel rate allocation are achieved by iterating two interdependent steps. Simulations clearly demonstrate the superiority of the proposed method over other recent algorithms for transmission of H.264/AVC streams
Here an improvement to our previous framework for satellite image fusion is presented. A framework purely based on the sensor physics and on prior assumptions on the fused image. The contributions of this paper are tw...
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Here an improvement to our previous framework for satellite image fusion is presented. A framework purely based on the sensor physics and on prior assumptions on the fused image. The contributions of this paper are two fold. Firstly, a method for ensuring 100% spectrally consistency is proposed, even when more sophisticated image priors are applied. Secondly, a better image prior is introduced, via data-dependent image smoothing
作者：
Acacio M. R. AmaralA. J. Marques CardosoFCTUC / IT
Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal ISEC
Department of Informatics and Systems Polytechnic Institute of Coimbra Coimbra Portugal
This paper presents an experimental technique that allows the determination of the reactance and ESR intrinsic values of aluminum electrolytic capacitors. The equivalent circuit of an electrolytic capacitor comprises ...
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This paper presents an experimental technique that allows the determination of the reactance and ESR intrinsic values of aluminum electrolytic capacitors. The equivalent circuit of an electrolytic capacitor comprises an equivalent series inductance (ESL), an equivalent series resistance (ESR) and a capacitance (C), whose values change with frequency. Therefore, the behavior of an electrolytic capacitor varies from approximately a simple capacitor for low frequencies, to a resistor at its resonance frequency, and finally to an inductor for frequencies higher than its resonance frequency. The knowledge of the resonance frequency of the electrolytic capacitors, as well as their equivalent circuit at the operating frequency becomes of paramount importance for designing purposes. The ESR is one of the most critical problems of static converters that operate near the resonance frequency of the electrolytic capacitors. An increased ESR value leads to a significant increase in the alternate component of the output voltage, requiring a constant action of the control system. To validate the proposed technique and to demonstrate its applicability some experimental and simulated results are presented
For monotone generated points on the plane we present the Dynamic Monotone Priority Search Tree (DMoPST) in main/external memory with O(1) update time/O(1) block transfers in worst-case. The external version of the st...
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For monotone generated points on the plane we present the Dynamic Monotone Priority Search Tree (DMoPST) in main/external memory with O(1) update time/O(1) block transfers in worst-case. The external version of the structure above promises efficient applications in transaction time Databases systems.
This paper presents conditions for stability of interconnected nonlinear systems consisting of integral input-to-state stable subsystems. Both the necessity and the sufficiency are investigated using a Lyapunov formul...
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ISBN:
(纸本)1424401704;9781424401703
This paper presents conditions for stability of interconnected nonlinear systems consisting of integral input-to-state stable subsystems. Both the necessity and the sufficiency are investigated using a Lyapunov formulation. The ultimate result is a necessary and sufficient condition for integral input-to-state stability (iISS) of the interconnection, which is believed to be the first of its kind. This paper derives two sufficient conditions. One is the iISS-ISS small-gain condition which has been proposed earlier by one of the authors. Its sufficiency is strengthened to cover situations more general than the earlier result. The other condition is a universal representation of the nonlinear small-gain condition which has been a popular tool for dealing with input-to-state stable (ISS) subsystems. This paper proves that, for establishing iISS property of the interconnection, the universal representation can deal with iISS subsystems as much as the iISS-ISS small-gain condition if supply rate functions are smooth everywhere and analytic at zero. Furthermore, two necessary conditions this paper derives demonstrate that the nonlinear small-gain condition in the universal form is also necessary for the iISS property
Administration of clinical photographs taken by commonly used digital camera often requires troublesome manual operation. In this paper, we made a prototype scheme of automatic photographed area identification from cl...
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We propose a novel scheme for error resilient image transmission. The proposed scheme employs a product coder consisting of LDPC codes and RS codes in order to deal effectively with bit errors. The efficiency of the p...
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We propose a novel scheme for error resilient image transmission. The proposed scheme employs a product coder consisting of LDPC codes and RS codes in order to deal effectively with bit errors. The efficiency of the proposed scheme is based on the exploitation of determinate symbols in Tanner graph decoding of LDPC codes and a novel product code optimization technique based on error estimation. Experimental evaluation demonstrates the superiority of the proposed system in comparison to recent state-of-the art techniques for image transmission.
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